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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbec11d8766c8c18c42b9d365fb45ddf38598eb5af8c4f8d9bf61ca4124270f' 
  AND token = 'qoRTs/+4/fBOp1orkYUI8Xb5PShESJhGXKfAo22cvGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}